ACR CREW MISIDENTED HOLDING POINT AFTER ACCEPTING A LAHSO CLRNC.

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VISUAL/VMC LNDG ON RWY 12. CLRED TO LAND; HOLD SHORT OF HIGH SPD RWY 1. CLRNC ACKNOWLEDGED. PLTS THOUGHT THAT HIGH SPD RWY 1 WAS A POINT ON THE PARALLEL TXWY TO HOLD SHORT OF AFTER CLRING AT TXWY Q4. DURING ROLLOUT; WE SAW THE HIGH SPD RWY 1 SIGN ON L OF RWY AND REALIZED WE WERE TRANSGRESSING INTO THE 'HOLD SHORT OF' PROTECTED SPACE. SIT WAS COMPLICATED BY A LONG ROLLOUT OF PREVIOUS TFC AND COCKPIT CREW DISCUSSION/BRIEF OF POSSIBLE GAR. WE CONTINUED BECAUSE: 1) WE COULD TOUCH DOWN IN TOUCHDOWN ZONE ON SPD AND PROFILE. 2) PREVIOUS ACFT WAS CLR. 3) WE HAD NORMAL BRAKING CAPABILITY. IN THE DIVERSION/DISTR OF THE LATE ROLLOUT OF PREVIOUS ACFT; WE MISSED THE NECESSITY TO HOLD SHORT; AND WE HAD MISUNDERSTOOD WHERE THE HOLD SHORT POINT WAS. THE CREW WAS ALERT; WORKED WELL TOGETHER; AND HAD BRIEFED THE POTENTIAL FOR A HOLD SHORT CLRNC. 45 MINS PRIOR TO LNDG AND AGAIN OUTSIDE THE MARKER. WE BELIEVE THAT HOLD SHORT LNDG CLRNCS ARE A POTENTIAL FOR DISASTER. (OUR COMPANY 10-7 PAGE HAS A PARAGRAPH DESCRIBING WHAT TO DO IN EVENT OF A 'HOLD SHORT OF HIGH SPD RWY 1 CLRNC.' EACH PLT READ THAT PARAGRAPH SEVERAL TIMES; BUT OVERLOOKED THE GRAPHIC FOR RWY HIGH SPD 1 POINT. WE THOUGHT IT WAS A POINT ON THE PARALLEL TXWY.)